Grp N rear dampers - raise the car?

[Liam_]

Running Bilstein Grp N fronts and 35mm 155lb Faulkner springs. After taking some measurements at standard and once the above setup has settled, I calculate the car has dropped 33 - 34mm.

http://www.drunken-student.co.uk/leeum/VTS/vts24.jpg

Car is going in tomorrow morning to have the Grp N rears fitted and rear dropping - was going to ask them to drop it 33mm but I understand these stiffer dampers can actually raise the rear a tad? Is it worth going a few mm lower to compensate for this?

Cheers

[Ashleyp]

your front will sort it self out once the springs settle (providing theyre new)

just go down 35 on rear, even if its 5mm out, you wont notice

edit, just seen youve left the springs to settle

[Liam_]

Springs (brand new) and dampers were fitted on Friday night - done just under 100 miles since then I rekon. Should have settled by now?

I'm happy with the height at the front, just want the rear dropped near enough the same as the front. :)

[sexy_gt]

front will drop a touch when the rear is droped.

[johnnyg_vts]

id buy some silver bulbs tbh

[Steve]

group n's pushed the rear of my car up.

Dont know why your fitting them with standard torsion bars, and not getting thickers soon.
Way overdampened imo :panic:

Glad i inspired you with your car however :D
Wilwood 4pots next?

[Liam_]

group n's pushed the rear of my car up.

Dont know why your fitting them with standard torsion bars, and not getting thickers soon.
Way overdampened imo :panic:

Glad i inspired you with your car however :D

Got them cheap enough so may aswell give em a try. Ron has offered me a trade + cash my way if I'm not too keen on them.

Pea shooter is going on the morn, just a set of wilwoods to fit next... iJest ;)

[Steve]

Anything is going to feel awesome over standard.
but if you drive it properly you'll see what i mean by over dampened ;)

[Liam_]

but if you drive it properly you'll see what i mean by over dampened ;)

Did you find it was tail happy?

[Steve]

Did you find it was tail happy?

inside rear wheel would slide and cause the rear to start coming out. Nothing major, but nothing you really want happening. Only does it when pushing it really. But isnt that the whole point of uprating suspension, to push the car harder?!

This is on the gas aswel non of this lift off oversteer shit before anyone comes out with, your lifting off the gas in corners.

Stuck the 21mm bars in and all that shit was gone :D

[saxo_ron]

Leeum the offer stands yo

[Liam_]

Will keep you in mind if I decide to get rid of them Ronneth.

Spoke to AlexR and he rekons with the Grp N rear dampers taking up the 'slack' the rear has as standard, probably looking at it being raised 5mm or so. Gonna go 35mm on the back - should be spot on I rekon. :)

[saxo_ron]

Lets hope not lol

[Liam_]

Lets hope not lol

haha! Two nails in one of those pilots ron, negative feedback en route. ;)

[Aron]

get some real bars that match the dampers and there wont be any lift.

[Steve]

also need to make sure the 21mm bars are the proper lb. (or what ever size bar you get)
Al use 21mm in this example.

There are some dodgy bars about which are 21mm in diametre kicking about but not the correct lb.
Depends how they are manufactured.

[Aron]

Yea stick to good makes. JP and his Dad have worked out that his 21mm's are not as high poundage rating but they do not need to be as they are more rigid.

[jpsaxo]

22mm Aron ;)

[Aron]

i am sorry Joshua, 22mm's

[jpsaxo]

Lol ;) They were weird when lowering thats all im saying!

[AlexR]

I never said anything about slack, the bilsteins contain high gas pressure which increases the effective total spring rate of the axle they are fitted to, this obviously means that the ride height will increase, the droop is reduced.

As for fitting uprated bars, obviously they will compress less when there is weight on them, so you need to set the trailing arms lower to compensate for that. As a rough rule, i fit 21mm bars with 15-20mm "lower" trailing arm to bodywork measurement for the same ride height as standard bars. 22s barely compress at all.

[Steve]

Alex can you remember what lb standard bars are?

[AlexR]

Sandy Brown measured wheel rates.

19mm 110lb/inch
21mm 165lb/inch
22mm 195lb/inch
23mm 235lb/inch

Front wheel rates, at a really rough calculation:

200lb spring = 240lb/in

[Steve]

*makes use of thanks button*